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https://issues.apache.org/jira/browse/OPENJPA-2766?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16739549#comment-16739549
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Romain Manni-Bucau commented on OPENJPA-2766:
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Guess you want
https://github.com/apache/aries-jpa/blob/master/jpa-container-eclipselink-adapter/src/main/java/org/apache/aries/jpa/eclipselink/adapter/UnionClassLoader.java,
https://github.com/apache/openjpa/blob/master/openjpa-lib/src/main/java/org/apache/openjpa/lib/util/MultiClassLoader.java
or
https://github.com/apache/tomee/blob/master/container/openejb-core/src/main/java/org/apache/openejb/util/classloader/MultipleClassLoader.java
> Modularity support
> ------------------
>
> Key: OPENJPA-2766
> URL: https://issues.apache.org/jira/browse/OPENJPA-2766
> Project: OpenJPA
> Issue Type: New Feature
> Reporter: Matt Pavlovich
> Priority: Major
>
> Support modular organization of entities so that all entities do not need to
> be contained in the same jar, or referenced in a single persistence.xml
> <class> listing.
> Use cases:
> 1. Jar A contains entityA, Jar B contains entityB. (EntityB may or may not
> extend from entityA.)
> 2. Jar X contains persistence.xml defining the PU
> 3. Jar C contains entityC and a list of classes that extend entityA. Jar X
> persistence unit should be able to persist entityC and its collection of
> entityA, entityB.. etc
> Features:
> 1. Auto-classpath scanning (perhaps for persistence-fragment.xml.. then
> enumerate)
> 2. Support manual registration and unregistration of entity classes (not just
> class names) to support OSGi environments that have per-bundle classloaders
> and deploy/undeploy support.
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